Aquilops americanus, the oldest horned-dinosaur from North America

Abstract [edit]: An associated cranium and lower jaw from the Cloverly Formation (?middle–late Albian, between 104 and 109 million years old) of southern Montana is designated as the holotype for Aquilops americanus gen. et sp. nov. Aquilops americanus. A. americanus probably originated via a dispersal from Asia into North America. LiveScience article.